基于分形理论的新疆额尔齐斯河流域湿地稳定性评价

利用1990、2000、2010年三期遥感影像，运用GIS和分形理论研究新疆额尔齐斯河流域近20年的湿地景观变化的复杂性和稳定性。结果表明：新疆额尔齐斯河流域各时段的湿地类型分布具有分形结构，湿地景观类型形状复杂性和斑块的稳定性波动变化，1990、2000和2010年三时期的各种湿地景观类型总平均分维值分别为1．4385、1．4387和1．4368。总平均稳定性指数分别为0．0615、0．0613和0．0632。三期湿地景观类型平均稳定性排序为：河渠〉湖泊〉水库坑塘〉永久性冰川〉滩地〉沼泽。滩地、沼泽稳定性相对较差。

Wetland Stability Analysis on Irtysh River Basin of Xinjiang Based on Fractal Theory and GIS

Taking advantage of TM remote sensing image from the year 1990, 2000 and 2010 and ap-plying GIS and fractal theory, the author has researched and studied the complexity and stability of wet-land landscape variation in Irtysh River Basin in recent two decades. The results of the research and study show that distribution of wetland type in Xinjiang Irtysh River Basin in different periods was of fractal structure; that there were fluctuation variations in complexity of wetland landscape types and shapes and in plaque stability; that the overall average dimension values of various wetland landscape types in the year 1990, 2000 and 2010 were 1. 4385, 1. 4387 and 1. 4368 ; that the indexes of overall average stability were 0. 0615, 0. 0613and 0. 0632; and that the average stability order of wetland landscape types in three periods is ; river waterway〉 lakes 〉 reservoir and swag 〉 permanent glacier 〉 shoaly land 〉 marsh, among which the stability in shoaly land and marsh are relatively poorer.